文件是否存在判定

@@ -5,6 +5,7 @@ import com.tianbo.util.Helper;
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.FileUtils;
 
 
 import java.io.*;
 import java.io.*;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.List;
 import java.util.Properties;
 import java.util.Properties;
 
 
@@ -44,7 +45,10 @@ public final class FileTool {
     }
     }
 
 
     public static List<File> readDirectoryFiles(File dir){
     public static List<File> readDirectoryFiles(File dir){
-        List<File> files = (List<File>)FileUtils.listFiles(dir,new String[]{"xml"},false);
+        List<File> files = new ArrayList<File>();
+        if (dir.exists() && dir.isDirectory()) {
+             files = (List<File>) FileUtils.listFiles(dir, new String[]{"xml"}, false);
+        }
         return files;
         return files;
     }
     }
     public static void writeWaybill(String path,String content,String waybillNo){
     public static void writeWaybill(String path,String content,String waybillNo){